It is the amount of time taken by a wave to go from one crest to the next crest, or one trough to the next.
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Oscillation is a common phenomenon in physics.Sound and electromagnetic radiation (radio, light, x-rays etc propagate as sinusoidal waves which are oscillations about a mean value. Springs, pendulums (penduli?) oscillate about their rest position in simple harmonic motion, which is oscillation about the mean.
Time period per oscillation=32/ 20=1.6 sec per oscillation.
time period
The period of a simple pendulum of length 20cm took 120 seconds to complete 40 oscillation is 0.9.
There is no relationship. They are independent. Either of those quantities can be changed without any effect on the other one. Except that when considering coupling, a greater amplitude or one component will have more effect in 'changing' the period of oscillation of the other to match the one with the high amplitude (via resonance).